Need help Api addcron not work (port 2082)

if i run code. it doesn't add cron to cpanel.
port 2082 can using api ?
(i don’t speak very good english, I m thai ^_^)

Code:

include("xmlapi.php");
$ip = "   ";
$cpuser =  "  ";
$cppass =  "  ";
$xmlapi = new xmlapi($ip);
$xmlapi->set_port(2082);
$xmlapi->password_auth($cpuser,$cppass);

$xmlapi->set_debug(1);
$args = array('php /home/myuser/public_html/CronTask.php >/dev/null 2>&1','*','*', '*', '*','*');
$xmlapi->api2_query($cpuser, 'Cron','add_line', $args);